Why does my mother define her relationship with me in terms of what worldy things she can give me?

My whole life my relationship with my mother has been frustrating.

She never tries to connect with me on an emotional level.

She always defines her relationship with me in terms of what material things she can provide me with.

Why is she like that?

For example there was a time in my life when we were estranged and the only ways she tried to get me to talk to her was by offering some worldly good. She never once tries to talk to me and connect with me at an emotional level.
The older I get the more it hurts me and she just doesn’t get it.
and
I think it might have something to do with the fact that she was very poor growing up.

Can someone try to explain this to me please and give me advice on what I should do going forward ?